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Isolated Analog Output for Arduino Uno

Isolated Analog Output for Arduino Uno
Isolated Analog Output for Arduino Uno
This project uses the Arduino Uno PWM output to realize a fully isolated analog output with a range of 0..5 V or more. The use of an averaged PWM signal is not comparable with a real DAC, but it has advantages of simplicity since it is sufficient to use an opto-coupler for isolating the digital PWM signal.

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Materials

Component list

Component List

Resistors

R1 = 330 Ω, ±5%
R2 = 5.1 kΩ, ±5%
R3 = 100 kΩ, ±5%
R4 = 100 kΩ, ±1% metal film

 

Capacitors
C1 = 100 nF, ceramic
C2 = 10 µF, 50 V Electrolytic
C3 = 200 nF, Mylar ±2%
C4 = 100 nF, Mylar ±2%

 

Semiconductors

IC1 = LM358 dual opamp
IC2 = LM78L05 regulator
IC3 = 6N136

 

Others

Arduino Uno board

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